360991 has 4 divisors (see below), whose sum is σ = 362232. Its totient is φ = 359752.

The previous prime is 360989. The next prime is 361001. The reversal of 360991 is 199063.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 199063 = 19 ⋅10477.

It is a cyclic number.

It is not a de Polignac number, because 360991 - 2¹ = 360989 is a prime.

It is a Duffinian number.

360991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (360901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81 + ... + 853.

It is an arithmetic number, because the mean of its divisors is an integer number (90558).

2³⁶⁰⁹⁹¹ is an apocalyptic number.

360991 is a deficient number, since it is larger than the sum of its proper divisors (1241).

360991 is an equidigital number, since it uses as much as digits as its factorization.

360991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 360991 is about 600.8252657803. The cubic root of 360991 is about 71.2030818638.

It can be divided in two parts, 36099 and 1, that added together give a square (36100 = 190²).

The spelling of 360991 in words is "three hundred sixty thousand, nine hundred ninety-one".